a =    (mydeg +180);    
    b = Math.round((850*a)/(myrpm)-3);        //length length of priamary pipe
    c = Math.sqrt((mycc /((b+3)*25)));         //inside diameter of priamary pipe
    c = (c *2.1);
    c = Math.round(c*1000)/1000;
    d = ((228*a)/(myrpm-500));            //induction length of carburator
    d = Math.round(d*1000)/1000;
    e = Math.sqrt((c *c)*2)*.93;        //two secondary pipe inside diameter
    e = Math.round(e*1000)/1000;
    f = 15;                           // fours primary length always 15 inch
    h = b-f;                    //length of secondary pipe
    g = Math.sqrt((mycc *2)/((b+3)*25))*2;     //tailpipe inside diameter
    g = Math.round(g*1000)/1000;
    j = (((c*2)-g)/2)*12.115;           //collector length was 7.115
    j = Math.round(j*1000)/1000;
    k = (b+3.4)-j;
    l = (myexdur+a);
    m = l;                      // Ehaust Duration
    n = (l /2) -myexdur;              //valve corecttly timed
    p = (myexdur *2);                  //overlap
    form.overlap.value =p;                //overlap
    form.fulllift.value =n;               //valve corecttly timed
    form.duration.value =m;               // Exhaust valve duration in Degrees.
    form.ind.value = d * 25.4;            //Carburetor induction Length in Inches.
    form.length.value = b * 25.4;             //1, Tuned length From the Valve Head.
    form.outside.value = c * 25.4;               //2, Primary inside Diameter is in Inches
//    form.secondary.value = h;            //3, Secondary Pipe Length in Inches.
//    form.inside.value = e;                //4, Two Secondary pipe inside diameter.
//    form.primary.value = f;            //5, Fours Primary Pipe Always (15" Inch)Long.
    form.collector.value = j * 25.4;            //6, Collector box Length in Inches.
    form.tailpipe.value = g * 25.4;            //7, Tailpipe inside in Inches.
    form.taillength.value = k * 25.4;            //8, Tailpipe Length in Inches.